Listen to them, offer them support and be a sounding board. And most importantly, don't judge them. Let them know that you love and support them, and that they can come to you for anything. Let your friend talk and let them know that you are there for them, both now and in the future, regardless of their decisions. Don't pressure them to leave the relationship.
Being aggressive about your friend leaving their partner and giving ultimatums could push your friend away and may feel like they can't talk to you. Let the conversations flow and be a good listener. Some people in toxic relationships start to realize that they do, but take the time to process it and weigh the various factors. Constantly tell your friend things that build their self-image, giving them the strength they might need to leave their partner. Challenge what your partner has said about them, if you have called them stupid or weak tell them that they are not.
This works much better for everyone involved if you avoid framing the situation in a negative way. If your friend is processing the problem but hasn't done anything about it yet, listen to him and don't judge him, especially if he trusts you enough to fill you up and talk to you about it. Instead, let them talk, vent and say everything they want to say and ask questions to learn more about the situation and help them. The last thing you want to do is control them and tell them to do anything, no matter how good your intentions are.
Also be careful when criticizing your partner, as you may not be ready to hear that. If you really care about someone, then your personal relationship with that person should be prioritized over your dislike for their partner or their relationship. Not only can this make your friend realize that something they thought was normal in their relationship isn't, but they'll also know that you're not judging them for staying in a toxic relationship if they've started to notice it on their own.
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